![]() The purpose of this study was to estimate the influence of facial muscle activity on the growth and development of the facial mesostructural skeleton in rabbits. We thus decided to undertake an experimental study to estimate the influence of the facial muscle activity on the facial mesostructural skeleton. ![]() The susceptibility of the skeletal unit of the nasomaxillary complex to these forces - due to its location along the median line and the center of the face - would be important for facial reconstruction surgery and especially for rhinology. 6įigure 1 shows the anterior and inferior arrangement of the muscle groups acting on the facial mesostructure of rabbits and humans. This assures that the bone component is remodeled, rather than only thickened. 4–6Īll external remodeling on a bone part is invariably accompanied by an inverse physiological phenomenon in the corresponding internal site. The forces resulting from cartilage development in the nasal septum 3 are useful only in the intrauterine growing and development phases, and appear to lose importance relative to the extrinsic forces exerted by soft tissues after birth. Inversely, traction forces on the periosteum causes osteoblasts to be activated, with resulting bone apposition in an effort to keep the bone fixed to its coating membrane. 4Ĭompression of the periosteum decreases the amount of blood flowing locally, which causes activation of osteoclasts and a resulting underlying bone resorption. The functional matrix theory states that soft tissues acting on the various bony parts composing the face are the determining factor for its anterior and inferior growth pattern. 3Īccording to the nasal septum theory, endochondral growth of this cartilage causes a sliding physical force over the nasal crest that displaces the maxilla forwards and downwards, resulting in this form of growth. The human face develops in an anterior and inferior projection. Various theories have tried to explain facial growth based on the fact that the face grows forwards and downwards, and that each bone component has ossification sites with different onset and formation rates. Studies on craniomaxillofacial embryology and growth have developed fundamental concepts for understanding and treating congenital and acquired facial deformities. The lack of muscle activity in half of the face produces an ipsilateral shift of the facial mesostructure in developing rabbits. Results were submitted for comparative statistical analysis. The facial mesostructure of the animals was removed in block for later morphometric studies through computer graphics made out of the digital pictures of the specimens. The study group animals had their facial nerves cut at the cervical root in one side. Materials and Methodsģ7 rabbits of two months of age were studied, divided in a study group and a control group, were followed up for a period of 4 months. To estimate the relevance of facial muscle activity on facial bones in lab rabbits. The possibility to modify muscle influence in the phase of facial development, or in postoperative of corrective surgery is of great preventive importance and it should be better investigated, since it could reduce the number and impact of these procedures. Based on the functional matrix concept, scientists developed the hypothesis that soft tissue acting on certain bone pieces determines the process of facial growth.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |